Anchor device for bolts.



B. FRANK & A. 0. LUNDBERG.

Y ANCHOR DEVICE POR BOLTS.

APPLIGATION FILED SEPT. 22, 1911.

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Patented Aug. 6, 1912.

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Specification of Letters Patent. Application filed September 22, 1911'.

Serial No. 650,841.

i To al whom fit muy concern.'

Be it known that We, BEECHERFRANK and irUcUsT O. LUNDBERG, citizens of the United States, residing at the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful lmprovements in Anchoring Devices for Bolts, of which the following isa specification.

Our invention relates to anchoring devices for bolts and more specifically to devices adapted for use where it is desired to secure the end of a bolt in concrete, cement or the like.

The' object of our invention is the production of adevice of the character mentioned which will be of extremely simple construc- One which may be readily and eX- peditiously inserted for use, and one' which will be of high etiiciency in operation,

Other objects will appear hereinafter. l

With these objects in View our invention consists inthe combinations and arrangements of parts hereinafter described and claimed.

Our invention will be best understood by reference to the accompanying drawing forming a part of this specification and in which,

Figure `1 is a side elevation of ananchoring device embodying our invention arranged in position for use upon the bolt, Fig. 2 is a perspective view of one Vof the anchor members of the device detached, and Fig. 3 is a view showing a section of a wall with our improved anchoring device arranged therein to anchor the bolt in position.

The preferred form of construction as illust-rated in the drawing comprises two similar members l formed preferably of l Each of the 4members l is wedge shaped in form and semi-circular in crosssection. The members l are adapted to' be arranged upon the opposite sides of the bolt 2 with their flat sides 3 adjacent the latter. Said surfaces 8 at the thick ends of said members l being centrally grooved or cut away at Ll in order to accommodate the bolt as willbe readily understood. The opposite ends of the members 1 are adapted to engage against the opposite sides 5 of the square head G of the bolt, said sidesv 5 being preferably inclined as shown to correspend with the inclination of the surfaces lVhen thus arranged upon a bolt the members l will be so disposed that the lateral surfaces parallel with the axis of the bolt, a mutilated cylinderbeing virtually formed by the Sides of `said members. The lower or contracted ends of the members l are bent inwardly as at 7 to serve as stops for engagement with the head 6 of the bolt so as to facilitate insertion of the members linto a hole, it being clear that with this provision the members l vmay be readily forced down into a hole or recess by simply forcing the projecting extremity of the bolt inwardly.

In using the device the members l are rstarranged about the bolt which it is desired to anchor in t-he manner shown in'.

F ig.'l. Said members together with the headed end of the bolt are then inserted into the hole or recess 9 which has been previously drilled for'the reception thereof. Upon outward drawing of the bolt 2 after thus positioning the members l, the latter will be expanded by Contact of the inclined surfaces 3 thereof with the sides 5 of the bolt head 6, it being clear that thefarther the bolt is drawn outwardly4 the greater will be the expansion or separation of the members 1, effecting the forcing of said members against the opposite sides of the recess or hole. This forcing of the members l against the sides of the recess serves to lock the same therein and hence to anchor the head of the bolt vin position.

In order kto positively prevent slipping of the members 1 upon the surfaces engaged thereby, the lateral or curved surfaces of said members are provided with gripping Ateeth 8 of any suitable form, circumferenytial teeth as shown in the drawing being preferably -formed therein. Said curved surfaces of the members l at the outer or thick ends of the latter are tapered or beveled as shown so that in use thev members l will not contact with the sides of the hole or recess adjacent the outer extremity thereof, such construction being adopted in order to prevent chipping or breaking out of the stone or concrete at the mouth of theopening becauseof the pressure which otherwise would be exerted thereon.

. An anchoring device of the construction set forth is extremely simple in construction, hence may be manufactured at a low cost. The device is capable of expeditious and ready arrangement for use and is adapted Patenten aug. e, raie.

thereof will be'substantially i lVliile we have illustrated and described the preferred construction for carrying our invention into eifect, the same is capable of variation or modification Without departing from the spirit of the invention. We therefore do not wish to be limited to the exact details of construction set forth, but desire to avail ourselves of such variations and modifications as come within lthe scope of the appended claim.

Having described our invention what we claim as new and desire to secure by Letters Patent is:

ln a device of 'the class described, the combination with a bolt having a head provided with opposite flat surfaces, of vtwo Wedge shaped members arranged at opposite sides of said bolt with their wedge surfaces engaging against said opposite flat surfaces of said bolt head, said fiat surface of said wedge shaped members at lthe thick ends of the latter being centrally grooved for a portion only of their extent, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

BEECHER FRANK. l AUGUST 0. LUNDBERG.

lVitnesses:

ARTHUR A. OLSON, J osHUA R. H. Po'r'rs. 

